AirHint found the following cheapest return flights from Basel (BSL) to St.-denis (RUN) in December 2025 (see full year).
Return flights
| 12 Dec - 25 Jan | easyJet | ||
| 30 Dec - 05 Jan | Air France | ||
| 17 Dec - 25 Dec | easyJet | ||
| 18 Dec - 02 Jan | Air France |
Also check the deals for one-way flights from Basel to St.-denis in December.
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